<template>
  <div id="root">
  <div class="todo-container">
    <div class="todo-wrap">
      <MyHeader :addTodo="addTodo"/>
      <MyList :todos="todos" :checkTodo="checkTodo" :deleteTodo="deleteTodo"/>
      <MyFooter :todos="todos" :checkAll="checkAll" :clearAll="clearAll"/>
    </div>
  </div>
</div>
  
</template>
<script>
// 引入组件
import MyFooter from './components/MyFooter'
import MyHeader from './components/MyHeader.vue'
import MyList from './components/MyList'

export default {
name:'App',
components:{MyHeader,MyList,MyFooter},
data() {
    return {
      todos:JSON.parse(localStorage.getItem('todos'))||[]
    }
  },
  methods:{
  addTodo(todoObj){
    this.todos.unshift(todoObj)
  },
  checkTodo(id){
    this.todos.forEach((todo)=>{
      if(todo.id===id) todo.done=!todo.done
    })
  },
  // 更新一个todo
  updatatodo(id,title){
    this.todos.forEach((todo)=>{
      if(todo.id===id) todo.title= title
    })
  },
  deleteTodo(id){
    this.todos=this.todos.filter(todo=>  todo.id!==id)
  },
  checkAll(done){
    this.todos.forEach((todo)=>{
      todo.done=done
    })
  },
  clearAll(){
     this.todos=this.todos.filter((todo)=>{
      return !todo.done
    })
  }
},
watch:{
  todos:{
    deep:true,
    handler(value){
      localStorage.setItem('todos',JSON.stringify(value))
    }
  }
},
mounted(){
  this.$bus.$on('updatatodo',this.updatatodo)
},
beforeDestroy(){
  this.$bus.$off('updatatodo')
}
}
</script>

<style>
  /*base*/
body {
  background: #fff;
}

.btn {
  display: inline-block;
  padding: 4px 12px;
  margin-bottom: 0;
  font-size: 14px;
  line-height: 20px;
  text-align: center;
  vertical-align: middle;
  cursor: pointer;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 1px 2px rgba(0, 0, 0, 0.05);
  border-radius: 4px;
}

.btn-danger {
  color: #fff;
  background-color: #da4f49;
  border: 1px solid #bd362f;
}
.btn-edit {
  margin-right: 6px;
  color: #fff;
  background-color: hotpink;
  border: 1px solid #bd362f;
}
.btn-danger:hover {
  color: #fff;
  background-color: #bd362f;
}
.btn-edit:hover {
  color: #fff;
  background-color: skyblue;
}
.btn:focus {
  outline: none;
}

.todo-container {
  width: 600px;
  margin: 0 auto;
}
.todo-container .todo-wrap {
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 5px;
}



/*main*/
.todo-main {
  margin-left: 0px;
  border: 1px solid #ddd;
  border-radius: 2px;
  padding: 0px;
}

.todo-empty {
  height: 40px;
  line-height: 40px;
  border: 1px solid #ddd;
  border-radius: 2px;
  padding-left: 5px;
  margin-top: 10px;
}




</style>